border-1px；避免移动端下边框部分2px

        .border-1px {
            position: relative;
        }

        .border-1px:after {
            display: block;
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            border-top: 1px solid rgba(7, 17, 27, .1);
            content: ' ';
        }

        @media (-webkit-min-device-pixel-ratio: 1.5),(min-device-pixel-ratio: 1.5) {
            .border-1px::after {
                -webkit-transform: scaleY(0.7);
                transform: scaleY(0.7);
            }
        }

        @media (-webkit-min-device-pixel-ratio: 2),(min-device-pixel-ratio: 2) {
            .border-1px ::after {
                -webkit-transform: scaleY(0.5);
                transform: scaleY(0.5);
            }
        }